Detect the activation of a bell's door switch - Electronic Circuits Projects Diagrams Free

BiDoU · 5th October 2004, 05:04 AM

Hi,

I want to detect when someone press the button of bell's door.
Maybe with a AC relay it's possible to do it? What is the best to detect it ? The transformer has 120V on side and on the other it's 18 VAC...

I uploaded what the circuit of the bell's door like...

gerty · 5th October 2004, 05:15 AM

Your circuit will work for as long as the button is pressed, as soon as the button is released the relay will drop out.. Is that what you want ?

Sebi · 5th October 2004, 07:42 AM

When the AC relay not available...

BiDoU · 5th October 2004, 01:45 PM

Quote:

Originally Posted by gerty

Your circuit will work for as long as the button is pressed, as soon as the button is released the relay will drop out.. Is that what you want ?

Yes, the contact of relay will activate a input of a microcontroller...

BiDoU · 5th October 2004, 01:53 PM

Quote:

Originally Posted by Sebi

When the AC relay not available...

Thank you, I didn't know that I have just to put a bridge rectifiers to use a DC Relay.

Sebi · 5th October 2004, 04:07 PM

For microcontroller interfacing more elegant an optocoupler...

BiDoU · 5th October 2004, 06:47 PM

Quote:

Originally Posted by Sebi

For microcontroller interfacing more elegant an optocoupler...

Ok thank you !

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5th October 2004, 05:15 AM	(permalink)
gerty	Your circuit will work for as long as the button is pressed, as soon as the button is released the relay will drop out.. Is that what you want ? __________________ gerty